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An Alternative Neural Network Approach to Calculate the Molecular Weight Distribution from Dynamic Rheological Properies of i-PP Resins

机译:从i-PP树脂的动态流变特性计算分子量分布的替代神经网络方法

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摘要

The calculation of the molecular weight distribution (MWD) of a polymer from its rheological properties is an attractive method since rheological measurements are comparatively faster and cheaper than the classical gel permeation chromatography technique (GPC).The calculation, however, still has some drawbacks, suck as the sensitivity of the mathematical solution involved (ill-posed problem)and the limited frequency range covered by commercial rheometers, which can be especially critical for crystalline polymers, for which the time-temperature superposition is of limited worth.In this article, a new approach for evaluating the MWD from rheological data obtained with different isotactic polypropylene resins. The results show that this approach can be successfully used to compute MWD curves and should expand the range of application of the rheological technique.
机译:从聚合物的流变特性计算分子量分布(MWD)是一种有吸引力的方法,因为与传统的凝胶渗透色谱技术(GPC)相比,流变测量相对更快,更便宜,但是该计算仍然存在一些缺点,由于所涉及的数学解决方案(不适定问题)的敏感性以及商用流变仪所涵盖的有限频率范围很糟糕,这对于结晶聚合物而言尤其重要,因为结晶聚合物的时温度叠加非常有限。一种从不同等规聚丙烯树脂获得的流变数据评估MWD的新方法。结果表明,该方法可成功用于计算MWD曲线,并应扩大流变技术的应用范围。

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